How to call a native app?

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I need to call the calculator from the click on a button, how can I do this? I’m having difficulties, I’m a beginner in Android and lost myself completely in the implementation of this code.

android

2 answers

3

The difficulty is that some manufacturers replace the pure Android standard calculator (package com.android.calculator2) by their own apps, which stay in a different package, then it becomes difficult to guess which is the calculator package.

But you can try to locate the standard calculator like this:

ArrayList<HashMap<String,Object>> items =new ArrayList<HashMap<String,Object>>();
final PackageManager pm = getPackageManager();
List<PackageInfo> packs = pm.getInstalledPackages(0);  
for (PackageInfo pi : packs) {
    if( pi.packageName.toString().toLowerCase().contains("calcul")){
        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("appName", pi.applicationInfo.loadLabel(pm));
        map.put("packageName", pi.packageName);
        items.add(map);
    }
}

and then you can call the app by doing:

if(items.size()>=1){
    String packageName = (String) items.get(0).get("packageName");
    Intent i = pm.getLaunchIntentForPackage(packageName);
    if (i != null) {
        startActivity(i);
    } else{
        // Aplicativo não encontrado
    }
}

Source: Soen

3


In this post http://www.intertech.com/Blog/android-intents-for-app-integration-call-a-calculator-play-video-open-an-editor/ found the following code:

You have to use Intent, add these variables to your class MyActivity:

private static final String CALCULATOR_PACKAGE_NAME = "com.android.calculator2";
private static final String CALCULATOR_CLASS_NAME   = "com.android.calculator2.Calculator";

Add this method to the other methods:

public void launchCalculator()
{
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    intent.setComponent(new Component Name(CALCULATOR_PACKAGE_NAME,
                                            CALCULATOR_CLASS_NAME));

    try {
        this.start Activity(intent);
    } catch (ActivityNotFoundException noSuchActivity) {
        // handle exception where calculator intent filter is not registered
    }
}

You use launchCalculator in the event your button click, for example:

     final Button button = (Button) findViewById(R.id.ID_DO_SEU_BOTAO);
     button.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
             launchCalculator(); //Chama o Intent
         }
     });

For some time I do not work with Java and Android, I may have wrong something in the code, let me know if it fails.

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